This is the time of the MLB season when one needs to pay attention to TBD, TBS and TNT.

TBD — to be determined — is often what’s noted when no one knows yet what time an MLB playoff game will start. Sometimes that blank isn’t filled in until 24-to-24 hours ahead, because it depends on what other games are in play, what major-market team has been eliminated, and how much the TV decision partners are motivated to creating a purpose-driven viewership.